At the above link, is a pretty good analysis of the effects of the Bush tax cuts. It seems that the Senate taxation committee relies on errant data or analysis in forecasting the effect of tax cuts.
If the objective of liberals is to increase revenue to the Treasury in order to pay for more social programs, the evidence points to tax cuts. If the objective is wealth redistribution, then tax increases are the answer.
So, do you want to help fund government programs, or do you want to punish the rich? Can't have it both ways.